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What is wrong with this UPDATE?


NOT IN has peculiar semantics. When manager_id takes on a NULL value, then the expression always returns either NULL or FALSE for all rows. That is, it will filter out all rows.

You can directly fix this by doing:

UPDATE hr.employees
    SET salary = 1000
    WHERE employee_id NOT IN (SELECT manager_id
from hr.employees WHERE manager_id is not null);

(The distinct is not needed either.)

In my opinion, a better approach is to use NOT EXISTS rather than NOT IN when you have a subquery.

UPDATE hr.employees
    SET salary = 1000
    WHERE NOT EXISTS (SELECT 1 from hr.employees e
WHERE e.manager_id = employees.employee_id);

This behaves in the more intuitive way when manager_id could be NULL.


Categories : SQL

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